He unsuccessfully contested the 1935 general election in Manchester Clayton, but after the death in 1940 of Peter Eckersley, the Member of Parliament (MP) for Manchester Exchange, Hewlett was elected unopposed in the resulting by-election. He lost the seat in the Labour Party's landslide victory at the 1945 general election.
In addition to his political interests, Hewlett was the chairman and managing director of the Anchor Chemical Company which is based in Clayton, Manchester and is now a subsidiary of the Air Products company.
- "House of Commons constituencies beginning with "M" (part 2)". Leigh Rayment's House of Commons pages. Retrieved 2009-05-03.
- Craig, F. W. S. (1983) . British parliamentary election results 1918–1949 (3rd ed.). Chichester: Parliamentary Research Services. p. 186,187. ISBN 0-900178-06-X.
- Yorkshire Post and Leeds Intelligencer. British Newspaper Archive. 5 November 1935. p. 4. Missing or empty
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- Hansard 1803–2005: contributions in Parliament by Thomas Hewlett
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|Member of Parliament for Manchester Exchange
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